DNS

Domain name service protocol. More...

Collaboration diagram for DNS:

Data Structures
struct	DNSHEADER
struct	DNSQUESTION
struct	DNSRESOURCE
Functions
void	NutDnsConfig2 (const uint8_t *hostname, const uint8_t *domain, uint32_t pdnsip, uint32_t sdnsip)
	Set DNS configuration.
void	DumpDnsHeader (FILE *stream, DNSHEADER *doh)
void	DumpDnsQuestion (FILE *stream, DNSQUESTION *doq)
void	DumpDnsResource (FILE *stream, DNSRESOURCE *dor)
void	NutDnsConfig (const uint8_t *hostname, const uint8_t *domain, uint32_t dnsip)
	Sets DNS configuration.
void	NutDnsGetConfig2 (char **hostname, char **domain, uint32_t *pdnsip, uint32_t *sdnsip)
uint32_t	NutDnsGetResource (const uint8_t *hostname, const uint16_t type)
	Retrieves IP-address corresponding to a host name.
uint32_t	NutDnsGetHostByName (const uint8_t *hostname)
uint8_t	NutDnsGetResourceAll (const uint8_t *hostname, const uint16_t type, uint32_t *ip_all)
	Retrieves all IP-address corresponding to a host name.
uint8_t	NutDnsGetHostsByName (const uint8_t *hostname, uint32_t *ip_all)
uint32_t	NutDnsGetMxByDomain (const uint8_t *hostname)
Variables
DNSCONFIG	confdns
DNSCONFIG	confdns

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Detailed Description

Domain name service protocol.

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Function Documentation

void NutDnsConfig2	(	const uint8_t *	hostname,
		const uint8_t *	domain,
		uint32_t	pdnsip,
		uint32_t	sdnsip
	)

Set DNS configuration.

Parameters:

hostname	DNS name of the local host.
domain	Name of the domain of the local host.
pdnsip	IP address of the primary DNS server.
sdnsip	IP address of the secondary DNS server.

References DNSCONFIG::doc_domain, DNSCONFIG::doc_hostname, DNSCONFIG::doc_ip1, DNSCONFIG::doc_ip2, free(), and strdup().

Referenced by main(), NutDhcpIfConfig(), and NutDnsConfig().

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void DumpDnsHeader	(	FILE *	stream,
		DNSHEADER *	doh
	)

References DNSHEADER::doh_addrr, DNSHEADER::doh_answers, DNSHEADER::doh_authrr, DNSHEADER::doh_flags, DNSHEADER::doh_id, DNSHEADER::doh_quests, and fprintf().

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void DumpDnsQuestion	(	FILE *	stream,
		DNSQUESTION *	doq
	)

References DNSQUESTION::doq_class, DNSQUESTION::doq_name, DNSQUESTION::doq_type, and fprintf().

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void DumpDnsResource	(	FILE *	stream,
		DNSRESOURCE *	dor
	)

References DNSRESOURCE::dor_class, DNSRESOURCE::dor_data, DNSRESOURCE::dor_len, DNSRESOURCE::dor_name, DNSRESOURCE::dor_ttl, DNSRESOURCE::dor_type, fprintf(), and fputc().

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void NutDnsConfig	(	const uint8_t *	hostname,
		const uint8_t *	domain,
		uint32_t	dnsip
	)

Sets DNS configuration.

Deprecated:

New applications should use NutDnsConfig2().

Parameters:

hostname	DNS name of the local host.
domain	Name of the domain of the local host.
dnsip	IP address of the DNS server.

References NutDnsConfig2().

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void NutDnsGetConfig2	(	char **	hostname,
		char **	domain,
		uint32_t *	pdnsip,
		uint32_t *	sdnsip
	)

References DNSCONFIG::doc_domain, DNSCONFIG::doc_hostname, DNSCONFIG::doc_ip1, and DNSCONFIG::doc_ip2.

uint32_t NutDnsGetResource	(	const uint8_t *	hostname,
		const uint16_t	type
	)

Retrieves IP-address corresponding to a host name.

This is a very simple implementation, which will not return any other resource information than the IP address.

Parameters:

hostname	Fully qualified domain name of the host.
type	Request type.

Returns:

IP address, which is zero, if the name could not be resolved.

References DNSCONFIG::doc_ip1, DNSCONFIG::doc_ip2, DNSHEADER::doh_answers, DNSHEADER::doh_id, DNSHEADER::doh_quests, DNSRESOURCE::dor_data, DNSRESOURCE::dor_len, DNSRESOURCE::dor_type, free(), malloc(), NutUdpCreateSocket(), NutUdpDestroySocket(), NutUdpReceiveFrom(), and NutUdpSendTo().

Referenced by NutDnsGetHostByName(), and NutDnsGetMxByDomain().

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uint32_t NutDnsGetHostByName

(

const uint8_t *

hostname

)

References NutDnsGetResource().

Referenced by main().

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uint8_t NutDnsGetResourceAll	(	const uint8_t *	hostname,
		const uint16_t	type,
		uint32_t *	ip_all
	)

Retrieves all IP-address corresponding to a host name.

This is a very simple implementation, which will not return any other resource information than the IP address.

Parameters:

hostname	Fully qualified domain name of the host.
type	Request type.
ip_all	Array of IP Addresses.

Returns:

Number of IP address, which is zero, if the name could not be resolved.

References DNSCONFIG::doc_ip1, DNSCONFIG::doc_ip2, DNSHEADER::doh_answers, DNSHEADER::doh_id, DNSHEADER::doh_quests, DNSRESOURCE::dor_data, DNSRESOURCE::dor_len, DNSRESOURCE::dor_type, NutHeapAlloc, NutHeapFree, NutUdpCreateSocket(), NutUdpDestroySocket(), NutUdpReceiveFrom(), and NutUdpSendTo().

Referenced by NutDnsGetHostsByName().

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uint8_t NutDnsGetHostsByName	(	const uint8_t *	hostname,
		uint32_t *	ip_all
	)

References NutDnsGetResourceAll().

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uint32_t NutDnsGetMxByDomain

(

const uint8_t *

hostname

)

References NutDnsGetResource().

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Variable Documentation

DNSCONFIG confdns

DNSCONFIG confdns